991 4978 — NUT,PLAIN,HEXAGON

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

991 4978: NUT,PLAIN,HEXAGON.

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND, nominal_thread_size: 0.875 INCHES IN, end_item_identification: HEMTT FAMILY (HEAVY EXPANDED MOBILITY TACTICAL TRUCKS); 2320-01-097-0260 HIAB CRANE (HEMTT). This part is cataloged in the U.S.

Government catalog under NSN 5310-01-213-4161, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS

991 4978

NSN: 5310-01-213-4161
FSC: 5310 — Nuts and Washers
CAGE: 34914 — HIAB USA INC (USA)

SPECIFICATIONS

thread_class	3B
thread_series	UNIFIED NATIONAL COARSE (UNC)
thread_direction	RIGHT-HAND
nominal_thread_size	0.875 INCHES IN
end_item_identification	HEMTT FAMILY (HEAVY EXPANDED MOBILITY TACTICAL TRUCKS); 2320-01-097-0260 HIAB CRANE (HEMTT)
thread_quantity_per_inch	9
NSN	5310-01-213-4161

COMPONENT DIAGRAM

KEY FEATURES

•

THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)

•

THREAD DIRECTION: RIGHT-HAND

•

NOMINAL THREAD SIZE: 0.875 INCHES IN

•

THREAD CLASS: 3B

•

THREAD QUANTITY PER INCH: 9

TECHNICAL CHARACTERISTICS

THREAD SERIES	UNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.875 INCHES IN
THREAD CLASS	3B
END ITEM IDENTIFICATION	HEMTT FAMILY (HEAVY EXPANDED MOBILITY TACTICAL TRUCKS); 2320-01-097-0260 HIAB CRANE (HEMTT)
THREAD QUANTITY PER INCH	9

OTHER ITEMS IN FSC 5310 — Nuts and Washers

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540

SUBSTITUTES & CROSS-REFERENCES 1

3999024Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 991 4978?

991 4978 is a NUT,PLAIN,HEXAGON.

What parts can replace 991 4978?

There is 1 known substitute for 991 4978: 3999024. Substitute compatibility should be verified for your specific system.

What is the NSN for 991 4978?

991 4978 is cataloged in the U.S. Government catalog under NSN 5310-01-213-4161. This indicates validated use in U.S. government and defense supply chains.

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991 4978 — NUT,PLAIN,HEXAGON

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